Control apparatus for an air conditioner

Abstract

A control apparatus for an air conditioner, which selects the operation of the air conditioner between a first mode of warming a room and a second mode of cooling a room, the first mode having a defrosting pause period for defrosting the outdoor heat exchanger, the second mode having a restart-preventing pause period for preventing restarting of a compressor motor, and the abovementioned selection between two modes is made by controlling a logic circuit 16 constituted as a semiconductor IC by applying specified controlling signal thereto.

What we claim is: 
     
       1. A control apparatus for an air conditioner comprising: a thermostat circuit including a temperature detection element and a comparator to issue an output upon detection of a reaching of measured temperature to a predetermined temperature,   a timer circuit including a clock generator and a counter, and   a logic circuit,   said thermostat circuit excluding said temperature detection element, said timer circuit and said logic circuit being formed in a semiconductor IC,   said logic circuit having a control terminal to receive a control input for switching logic gates therein thereby selecting connections of the logic circuit between   a first connection for defrosting of an outdoor unit in a room heating operation wherein a detection of an output signal from said thermostat circuit is interrupted for a first specified time period, thereafter said counter begins counting of a second specified time period and a switch for reversing a flow direction of a refrigerant gas is actuated upon receipt of an earlier one of respective output signals from said thermostat circuit and said timer circuit,   and a second connection for temperature controlling for a room cooling operation wherein said thermostat circuit controls the actuation of said compressor motor independently from the output of said timer circuit, a hysteresis voltage is given to said thermostat circuit at a stopping of said compressor motor and said timer circuit counts a third specified time period after stopping of said compressor motor.   
     
     
       2. A control apparatus for an air conditioner in accordance with claim 1, wherein said IC has a reset terminal to receive an input to reset said counter. 
     
     
       3. A control apparatus for an air conditioner in accordance with claim 1, wherein a capacitor and a resistor for determining a frequency of said clock generator are provided outside said IC and connected thereto. 
     
     
       4. A control apparatus for an air conditioner in accordance with claim 1, wherein said hysteresis voltage is made zero, after counting of said third specified time period by said counter after stopping of said compressor motor. 
     
     
       5. A control apparatus for an air conditioner in accordance with claim 1 further comprising a control circuit and a capacitor, said control circuit being for prevention of the operation of said compressor motor for a fourth specified time period after said capacitor begins discharging.   
     
     
       6. A control apparatus for an air conditioner in accordance with claim 1, wherein said temperature detection element is for detection of a temperature at an outdoor heat exchanger.   
     
     
       7. A control apparatus for an air conditioner in accordance with claim 5, wherein said counter is for counting said fourth specified time period after said third specified time period.